William E. Boeing, founder of the company that designed the 747, had to______manufacturing bedroom furniture to survive some lean years.

【正确答案】 B

【答案解析】Come to“达到，继承，复苏”；turn to“转向，变成，求助于，致力于”；add to“增加”；ap—ply to“将…应用于”。再如句型turn to sb．for help“向某人求助”。故选B。